He failed in his attempt to develop a more moral and less imperialistic policy in Latin American because he disregarded his ambassador by sending him home for being too aggressive. He also made decisions and took actions without the consent of the US Government. He ordered the Mexican port of Veracruz to be seized.
Okay, so obviously nuclear weapons proved to be a threat that would possibly destroy the world. The Soviet Union and the United States build up a stockpile of nuclear weapons and used the fact that the world may be destroyed to keep the other country at bay.
The foreign policy issue that was a motivation for American intervention in Vietnam was the idea of "containment" which sought to contain communist expansion where it was, as opposed to attempting to eradicate it at the source.
The answer to this question is:
How did the success of Portugal's exploration of Africa affect Spain?
"It Required Spain to leave the eastern route of Africa so they can so they can head to the east"
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